Screw press



E. V. JUNG SCREW PRESS Oct. 3, 1961 2 Sheets-Sheet 1 Filed May 26, 1959IN VENTOR Z/"Zdfld 211247;;

BY J me/2 A RNEY5 Oct. 3, 1961 v, JUNG 3,002,446

SCREW PRESS Filed May 26, 1959 2 Sheets-Sheet 2 INVENTOR BY W *M ATORNFY5 United States Patent 3,002,446 SCREW PRESS Erland Viktor Jung,Landskrona, Sweden, assignor to Aktiebolaget Landsverk, Landskrona,Sweden Filed May 26, 1959, Ser. No. 815,921 Claims priority, applicationGermany Jan. 7, 1959 6 Claims. (Cl. 100-145) This invention relates to avertical screw press and particularly to the type thereof comprising aspindle with outwardly extending screw blades, a surrounding stationarydrainage jacket and an upper central hopper for the material to bepressed, such as beet pulp and other kinds of pulp.

In known presses of this kind the motor and the gear for driving thespindle are usually provided above the hopper, through which the shaftextends. This arrangement reduces the space within the hopper, and thematerial must be fed to the hopper from the side by means of a separatefeeding screw. As the volume of this material is c onsiderably largerthan the pressed and discharged material, it is difiicult to feed andequally distribute the required material around the shaft of thespindle. The uneven distribution involves the inconvenience that theshaft of the spindle will be exerted to an eccentric pressure andtherefore must be dimensioned with respect thereto. As the shaft passesthrough the hopper and as it is desired to have a hopper of a greatheight for obtaining a certain pressure for feeding the material inbetween the screw blades the shaft obtains a great length and must begiven a corresponding diameter. As further the motor and the gear areprovided at a high level the access thereto may be uncomfortable.

An object of the invention is to provide driving means for the screw atthe top of the spindle in such a way that the upper shaft end isshortened.

Another object of the invention is to apply the driving means at the topof the spindle in such a manner that at least the upper portion of thehopper is free of the shaft, so that the material to be pressed may beaccumulated to a suflicient height and be more evenly distributed.

A further object of the invention is to provide a driving gear allowingthe material to pass through the same on its way through the press.

Other objects and advantages of the invention will become apparent uponreading the following specification and studying the accompanyingdrawings in which:

FIGURE 1 is a vertical sectional view of a press having the driving gearwheel provided on the upper axle neck of the spindle.

FIGURE 2 is a sectional view on an enlarged scale of a sealing devicefor the driving gear wheel.

FIGURE 3 is a sectional view of a screw press having a driving gear ringsecured to the screw blades.

In the drawings, a spindle with a casing or body 1, which diminishesupwards along a suitable curve, such as conically or parabolically,carries pairs of screw 'blades or flights 2 which rotate at a shortdistance from a surrounding, cylindrical drainage jacket 3 locatedwithin a housing 4. Resistors 5 secured to the housing extend throughthe jacket 3 and between the different pairs of flights 2 forcounteracting the tendency of the pressed material to rotate with thespindle. An upper axle neck 6 and a lower axle neck 7 may form the endsof a spindle shaft or may be made as separate parts secured to thecasing 1. The upper axle neck 6 is journalled in a bearing 8 which issupported by preferably three arms 9 passing with their outer endsthrough the jacket 3 and being welded to a ring-shaped frame 10. Thearms 9 are made thin and high in order to offer only a slight resistanceto the material passing downwards between the arms and simultaneouslyguide the material and prevent it from 5 3,902,446 Patented Oct. 3, 1961rotating with the spindle. The lower axle'neck 7 is journalled in athrust bearing 11 provided in the base portion of the press.

Above the bearing 8 a hub 12 is fastened to the axle neck 6 by means ofa key not shown, and by preferably three arms 13 it is connected with agear ring 14 engaging a gear wheel 15 on the shaft of a gear reductionmotor 30. Also the arms 13 are made thin and high, and for feeding thematerial downwards between the arms 9 of the bearing 8 they form obliqueshovels or wings. The gear ring 14 has an upper flange 16 and a lowerflange 17, of which the flange 16 embraces the lower edge of the wall 18of a hopper and the flange 17 embraces an upwardly directed flangesecured by a horizontal ring to the frame 10 and forming an extension ofthe jacket 3. Between the rotating flanges 16, 17 and the opposite,stationary surfaces sealing rings 19 are provided, and the inner surfaceof the gear ring forms a continuous connection between the jacket 3 andthe wall 18. A plate 20 covering the hub 12 is fastened to the endsurface of the axle neck 6 by means of bolts and carries a conical hood21 for guiding the material. The ring-shaped frame 10 forms the supportof a bar-shaped frame portion 22 which serves as a base for the motor 30and also carries the hopper 18. The hopper, which has a conical anddownwards Widening form, has a height considerably greater than itsdiameter. It has an upper, central charging opening 23 to which thematerial is fed by means of a separate screw 24. By this arrangement thematerial is very evenly distributed around the axis of the spindle toprevent eccentric stresses on the spindle. The arms 9 and 13 representonly a slight resistance to the material, and by the weight of thematerial in the high hopper and by the additional pressure from thewings 13 a compressed filling of the uppermost screw blades 2 will beobtained, whereby the capacity of the press will be increased.

The embodiment of the invention shown in FIGURE 3 differs from thataccording to FIGURES 1 and 2 especially in the mounting of the gear ring14, which is welded directly to four screw blades 27 provided on thespindle in the first press section, but it is also possible to mount thegear ring at a lower level above the lowest portion of the screw blades.Instead of the arms 13 the hood 21 is provided with upper projecting,oblique feeding Wings 28 and similar lower wings 29, between which oneor more resistors 5 are provided, which are secured to the hopper walland counteract the tendency of the material to rotate.

I claim:

1. A vertical screw press comprising a spindle with outwardly extendingscrew blades, a surrounding stationary drainage jacket, a central hopperforming an upper extension of said jacket and extending above the topportion of said spindle, a bearing for an upper axle neck of the spindleprovided at a level above said screw blades and supported by a pluralityof outwardly extending arms connected to a ring-shaped frame around saidspindle, and a driving gear ring secured to the spindle at a level belowsaid hopper and above the lowest portion of the screw blades and formingwithin the gear ring a passage for the material passing downwardly fromsaid hopper.

2. A vertical screw press comprising a spindle with outwardly extendingscrew blades, a surrounding stationary drainage jacket, a central hopperforming an upper extension of said jacket and extending above the topportion of said spindle, a bearing for an upper axle neck of the spindleprovided at a level above said screw blades and supported by a pluralityof outwardly extending arms connected to a ring-shaped frame around saidspindle, and a driving gear ring located at a level below said hopperand above the lowest portion of the screw blades and secured to theupper axle neck of the spindle by means of a hub and arms connecting thegear ring with the hub and forming passages between the arms for thematerial passing downwardly from said hopper.

3. A screw press as claimed in claim 2, wherein the gear ring is locatedbetween the hopper and the bearing and the arms of the gear ring areformed as oblique wings for feeding the material to be pressed.

4. A vertical screw press comprising a spindle with outwardly extendingscrew blades, a surrounding stationary drainage jacket, a central hopperforming an upper extension of said jacket and extending above the topportion of said spindle, a bearing for an upper axle neck of the spindleprovided at a level above said screw blades and supported by a pluralityof outwardly extending arms located within said hopper, and a drivinggear ring surrounding the screw blades and secured to said screw blades.

5. A vertical screw press comprising a spindle with outwardly extendingscrew blades, a surrounding stationary drainage jacket, a central hopperforming an upper extension of said jacket, a bearing for an upper axleneck of the spindle provided at a level above said screw blades andsupported by outwardly extending arms, and a driving gear ring securedto the spindle and forming within the gear ring a passage for thematerial to be pressed, 25

said gear ring being located between the drainage jacket and the hopperand having a lower sealing ring bearing against the jacket and an uppersealing ring bearing against the hopper.

6. A vertical screw press comprising a spindle with outwardly extendingscrew blades, a surrounding stationary drainage jacket and extendingabove the top portion of said spindle, a central hopper forming an upperextension of said jacket and having a height above the upper portion ofthe spindle exceeding its width, a feeding device located at the top ofthe hopper, a bearing for an upper axle neck of the spindle provided ata level above said screw blades and supported by a plurality ofoutwardly extending arms, oblique feeding wings secured to the topportion of the spindle above said bearing, and a driving gear ringsecured to the spindle at a level below said hopper and above the lowestportion of the screw blades and forming within the gear ring a passagefor the material passing downwardly from said hopper.

References Cited in the file of this patent UNITED STATES PATENTS

